# Mason jars: regular (70 mm) and wide-mouth (86 mm), half-pint to half-gallon

> What is the diameter of a mason jar lid?

- Category: Hardware › Found & household materials
- Kind: Standard part
- Basis: Ball / Kerr standard: regular mouth 70 mm (2.75 in) lid, wide mouth 86 mm (3.38 in) lid; jar outer dimensions typical, vary ±2 mm by maker
- Page: https://xemstudio.com/objects/mason-jars-and-lids/ · JSON: https://xemstudio.com/api/geometry?object=mason-jars-and-lids · Plain text: https://xemstudio.com/objects/mason-jars-and-lids/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses

## Notes

- Lids: regular mouth Ø70 mm, wide mouth Ø86 mm (the flat disc); bands are 72 and 88 mm OD. Thread on the jar: 70 mm continuous-thread finish, about 15 mm tall; 86 mm about 17 mm.
- Jars (regular mouth): half-pint 8 oz Ø65 × 95 mm; pint Ø78 × 130; quart Ø90 × 175. Wide mouth: pint Ø86 × 125; quart Ø90 × 170; half-gallon Ø110 × 240. Glass 2.5–3.5 mm.
- A printed disc that replaces the flat lid is Ø70.0 or Ø86.0 × 2 mm and clamps with the stock band: that is the pressure boundary for a jar-bodied engine or a vacuum chamber (a quart jar holds full vacuum with margin). Keep flames off the glass; the jar is the cold side.

## Sizes

| jar | mouth | lid_dia_mm | band_od_mm | jar_od_mm | height_mm |
|---|---|---|---|---|---|
| half-pint | regular | 70 | 72 | 65 | 95 |
| pint | regular | 70 | 72 | 78 | 130 |
| quart | regular | 70 | 72 | 90 | 175 |
| pint | wide | 86 | 88 | 86 | 125 |
| quart | wide | 86 | 88 | 90 | 170 |
| half-gallon | wide | 86 | 88 | 110 | 240 |

## Where the files are

- Wikipedia: [Mason jar](https://en.wikipedia.org/wiki/Mason_jar) — web — CC BY-SA 4.0 (text)
- Ball (Newell Brands): [Ball canning jars and lids](https://www.ballmasonjars.com/) — web — Ball site (verify at link)
- Long Earth Society: [Engine builds (videos and write-ups)](https://longearthsociety.com/engineering/) — web, video — LES site

## Questions

**What diameter is a regular mouth mason jar lid?**

70 mm (2.75 in) flat lid; the band is 72 mm OD. Wide mouth is 86 mm with an 88 mm band.

**Can I 3D print a mason jar lid?**

Print a Ø70 (or Ø86) × 2 mm disc and clamp it with the stock band; add a 1 mm silicone gasket for pressure or vacuum.

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